This superb model features an extended inner plate for enhanced chain engagement & retention & Quick-Link technology for easily attaching it to your ride. Specifically engineered for MTB use, its proprietary design ensures smooth shifts & strength, even on the roughest of terrain conditions. To top it off, its Sil-Tec coating provides an incredibly-low friction surface treatment for enhanced system performance & longevity. Technologies: Hyperglide+: Hyperglide+ drivetrain’s redesigned cassette & chain promotes the next generation of MTB riding by enhancing speed, shifting efficiency & smoothness over any terrain. It will help kickstart the next generation of mountain bike riding by introducing continuous pedalling over virtually any terrain. This revamped drive system & dedicated chain deliver fast shifting, efficient power transfer & chain stability like you’ve never experienced before. It helps riders adapt to drastically changing trail conditions by precisely judging the optimal shifting moment for consistently smooth operation. Quick-Link: Tool-free assembly provides great convenience to users. Sil-Tec: Shimano's ultra-low friction surface treatment. Superior to simple coating, Seil-Tec is an advanced plating process that improves system performance through the use of embedded fluorine particles. Sil-Tec products run smoother & wear longer in all conditions.